WO2012163120A1

WO2012163120A1 - Refrigerating multi-connected central air conditioning device with a screw compressor

Info

Publication number: WO2012163120A1
Application number: PCT/CN2012/071805
Authority: WO
Inventors: 程德威; 姜灿华
Original assignee: 宁波奥克斯电气有限公司
Priority date: 2011-05-30
Filing date: 2012-03-01
Publication date: 2012-12-06
Also published as: CN202126031U

Abstract

Disclosed is a refrigerating multi-connected central air conditioning device with a screw compressor, in which an exhaust pipe (8) connected with an oil-gas separator (10) is provided at an exhaust opening (3), an outlet of the oil-gas separator (10) is in communication with an inlet of a condenser (12), an outlet of the condenser (12) is in communication with a reservoir (13), the reservoir (13) is in communication with inlets of a plurality of indoor machines (15) installed in parallel via a main liquid feeding pipe (24), the main liquid feeding pipe (24) is in communication with a spraying opening (9), outlets of the indoor machines (15) installed in parallel are in communication with an inlet of a gas-liquid separator (11), and an outlet of the gas-liquid separator (11) is in communication with an air suction opening (2) via an air returning pipe (19). The central air conditioning device has advantages of a higher maximum power and a smaller floor space for the outdoor machines, better working security of the lubricating oil, lower usage costs, and less initial investment for customers.

Description

Single cold type screw compressor multi-unit central air conditioner

[0001] The utility model belongs to the field of air conditioning equipment, and particularly relates to a multi-unit central air conditioner device for a single cold type screw compressor.

Background technique

[0002] Due to its technical advantages, multi-unit central air-conditioning has become more and more widely used in applications such as apartments, villas, banks, restaurants, KTV, commercial office buildings, stations, shopping malls, etc. With the continuous expansion of multi-channel central air-conditioning applications, the area of large stations, shopping malls, food processing plants, etc. now reaches tens of thousands of square meters. However, most of the compressors of the prior art multi-unit central air conditioners are scroll compressors, and some are screw compressors.

[0003] However, the former is limited by the power of a single set of scroll compressors. The maximum power of each scroll compressor is only 64HP. For large-scale applications, a large number of scroll compressors are required for combination, so the outdoor unit accounts for The floor area is very large, and in some cases it is impossible to put all the outdoor units down; on the other hand, the more the scroll compressors, the greater the pressure of the oil balance reliability between the compressors, and the safety of the lubricating oil operation. The worse.

[0004] The latter is a heat pump type screw compressor multi-unit central air conditioner, suitable for large-scale applications requiring indoor cooling in indoor rooms in summer, and heating in indoor rooms in winter, but in high-profile applications such as food processing workshops and film production workshops. In the case of heat, whether in the winter or in the summer, the workshop generates a large amount of heat, which inevitably leads to the idle mode of the heating mode, so the use cost is higher, and the initial investment of the user is also increased.

Utility model content

[0005] The utility model provides a single cold type screw with large maximum power of the outdoor unit, small outdoor unit footprint, good lubricating oil operation safety, low use cost and small initial investment of the user. Compressor multi-unit central air conditioning unit.

[0006] The technical solution for solving the above problems is: providing a single-cooled screw compressor multi-unit central air-conditioning device having the following structure, comprising at least one screw compressor, a plurality of parallel indoor units, a liquid storage device, a condenser, a gas-liquid separator, an oil and gas separator, a gas return pipe and a main liquid supply pipe, wherein the screw compressor is provided with an exhaust port, a liquid discharge port and an air suction port, and the exhaust port Providing an exhaust pipe in communication with the inlet of the oil separator, the outlet of the oil separator is connected to the inlet of the condenser, and the outlet of the condenser is connected to the reservoir, and the liquid storage device is supplied by the main The liquid pipe is connected to a plurality of parallel indoor unit inlets, and the main liquid supply pipe is simultaneously connected with the liquid discharge port, and the plurality of parallel indoor unit outlets are connected with the inlet of the gas-liquid separator, the gas liquid The outlet of the separator is connected to the suction port via the return air pipe; the communication refers to communication through the pipe. [0007] After adopting the above structure, compared with the prior art, the utility model adopts a screw compressor, and the screw compressor has a large power, and the maximum power can reach nearly 400 HP, which is far greater than the conventional scroll compressor. The maximum power is 64HP, so the required number of compressors can meet the needs of indoor units, the floor space is smaller, the oil balance between compressors is better, and the safety of lubricating oil operation is better, the cost It is also relatively low; and it has only the cooling capacity compared with the multi-unit central air-conditioning unit of the heat pump type screw compressor, but it eliminates the main four-way reversing valve, the electromagnetic valve associated with the hot gas bypass, the four-way reversing valve, The heating throttling assembly and the one-way valve in parallel with the throttling assembly have lower cost of use and less initial investment by the user. Therefore, the utility model has the characteristics that the outdoor machine has large maximum power, the outdoor unit has a small floor space, the lubricating oil has good operation safety, the use cost is low, and the initial investment of the user is small.

[0008] As an improvement, the bottom of the oil and gas separator is provided with a oil return port, and the oil return port and the air inlet port are connected through a pipeline, and the pipeline between the oil return port and the air inlet port is provided back. The oil solenoid valve, the oil accumulated at the bottom of the oil separator will be replenished into the screw compressor through the pipeline, and the setting of the oil return solenoid valve allows the air conditioning control device to control the oil accumulated at the bottom of the oil separator to the screw compression at any time. In the machine, to prevent the screw compressor from being deficient in oil, the phenomenon of burnout occurs, and when the oil is not needed, the pipeline can be closed to prevent oil leakage and oil leakage.

[0009] As a further improvement, the bottom of the gas-liquid separator is provided with an oil outlet, the oil outlet and the return air pipe are connected through a pipeline, and the pipeline between the oil outlet and the return air pipe is provided Oil solenoid valve, when the oil in the oil separator can not meet the oil replenishment requirement of the screw compressor, the oil accumulated at the bottom of the gas-liquid separator can be replenished into the screw compressor through the oil discharge solenoid valve, so the operation of the lubricating oil Better security.

[0010] As a further improvement, the exhaust pipe and the return air pipe are connected by a pipeline, and the pipeline is provided with an unloading electromagnetic valve, and if an emergency condition occurs in the air conditioner, the exhaust solenoid valve is directly opened and exhausted. The high temperature and high pressure refrigerant in the tube is discharged into the return air pipe, which can effectively ensure the safety of the operation of the air conditioner.

[0011] As a further improvement, the screw compressors are three, and the screw compressor is further provided with an oil heater, an oil balance hole and an oil sight glass, and oil balance holes of each screw compressor Balanced oil pipe connection is provided between them, and the lubricating oil in each screw compressor has better balance, preventing the screw compressor from being burnt due to lack of lubricating oil; the oil heater can dissolve the lubricating oil The refrigerant evaporates to prevent the refrigerant from entering the compression chamber, and the liquid hammer causes the compressor to be damaged. Therefore, the lubricating oil of the utility model has better safety.

[0012] As a further improvement, the pipelines connected between the components are provided with a shut-off valve, and in the maintenance, only the ball valves at the opposite ends of the fault are closed, and the repair or replacement can be performed. The device makes the maintenance of the utility model more convenient.

[0013] The pipe of the liquid discharge port is provided with a thermal expansion valve and a liquid injection electromagnetic valve.

[0014] The main liquid supply pipe is provided with a liquid supply electromagnetic valve. [0015] A check valve is arranged on the pipeline between the oil separator and the condenser.

DRAWINGS

[0016] The drawing is a schematic structural view of a multi-unit central air-conditioning device of a single-cooling type screw compressor of the present invention.

[0017] As shown: 1, compressor, 2, suction port, 3, exhaust port, 4, oil balance hole, 5, oil heater, 6, oil level sight glass, 7, balance oil pipe, 8 , exhaust pipe, 9, spray port, 10, oil separator, 11, gas-liquid separator,

12, condenser, 13, reservoir, 14, oil return, 15, indoor unit, 16, oil return solenoid valve, 17, thermal expansion valve,

18, spray solenoid valve, 19, return air pipe, 20, unload solenoid valve, 21, oil outlet, 22, oil solenoid valve, 23, check valve, 24, main supply pipe, 25, liquid supply solenoid valve .

DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0020] As shown in the accompanying drawings, a single cold type screw compressor multi-unit central air conditioner includes at least one screw compressor 1 (three in this example), a plurality of parallel indoor units 15, and a liquid storage , a condenser 12, a gas-liquid separator 11, an oil separator 10, a return gas pipe 19 and a main liquid supply pipe 24, the screw compressor 1 is provided with an exhaust port 3, a liquid discharge port 9 and an air suction port The exhaust port 3 is provided with an exhaust pipe 8 communicating with the inlet of the oil separator 10, and the exhaust pipe from the exhaust port 3 of the three screw compressors 1 is collected by the four taps to the exhaust pipe 8 The exhaust pipe 8 is in communication with the inlet of the oil separator 10; the outlet of the oil separator 10 is in communication with the inlet of the condenser 12, and the outlet of the condenser 12 is in communication with the accumulator 13, the storage The liquid supply device 13 is connected to a plurality of parallel indoor units 15 via a main liquid supply pipe 24, and the main liquid supply pipe 24 is simultaneously connected to the liquid discharge port 9, and the plurality of parallel indoor units 15 are connected to the gas and liquid. The inlet of the separator 11 is in communication, and the outlet of the gas-liquid separator 11 passes through the return pipe 19 and the suction 2 communicates return joint pipe 19 is divided into three quarters branched return air duct, which communicates three gas pipelines respectively branched intake port 2 of the three screw compressor; is intended to mean the communication through the conduit. Of course, each component is provided with a temperature sensor to assist the control device to control the operation of the component.

[0021] The bottom of the oil and gas separator 10 is provided with a oil return port 14, the oil return port 14 and the air inlet port 2 are connected through a pipe, and the pipeline between the oil return port 14 and the air inlet port 2 is provided. There is a return solenoid valve 16. Specifically, the pipe from the oil return port 14 is divided into three branch pipes, which are respectively connected with the suction ports 2 of the three screw compressors, and the oil return solenoid valves are provided on the three branch pipes. 16.

[0022] The bottom of the gas-liquid separator 11 is provided with an oil outlet 21, and the oil outlet 21 is connected to the air return pipe 19 through a pipeline, and the pipeline between the oil outlet 21 and the return air pipe 19 is provided. There is an oil solenoid valve 22.

[0023] The exhaust pipe 8 and the return air pipe 19 are connected by a pipe, and the pipe is provided with an unloading solenoid valve 20.

[0024] The pipe of the liquid discharge port 9 is provided with a thermal expansion valve 17 and a liquid discharge solenoid valve 18.

[0025] The screw compressors are three, and the screw compressor is further provided with an oil heater 5, an oil balance hole 4 and oil. The position mirror 6 is provided with a balance oil pipe 7 connected between the oil balance holes 4 of the respective screw compressors.

A check valve 23 is disposed on the pipe between the oil separator 10 and the condenser 12.

[0027] The main liquid supply pipe 24 is provided with a liquid supply electromagnetic valve 25, and a connection point between the main liquid supply pipe 24 and the liquid discharge port 9 is located between the liquid supply electromagnetic valve 25 and the indoor unit 15.

[0028] A shut-off valve is disposed on the pipe communicating between the components.

[0029] The above embodiments are only preferred embodiments of the present invention, and the present invention is not limited to the above embodiments, and other structural changes are allowed, such as: one, two, five, or eight screw compressors. Etc., within the scope of the independent claims of the present invention, are within the scope of protection of the present invention.

Claims

Claim

1. A single cold type screw compressor multi-unit central air conditioner, comprising at least one screw compressor (1), a plurality of parallel indoor units (15), a liquid reservoir (13), a condenser (12) a gas-liquid separator (11), an oil-gas separator (10), a return gas pipe (19) and a main liquid supply pipe (24), characterized in that: the screw compressor (1) is provided with an exhaust port ( 3), a liquid discharge port (9) and an air suction port (2), the exhaust port (3) is provided with an exhaust pipe communicating with the inlet of the oil separator (10)

(8), the outlet of the oil separator (10) is in communication with the inlet of the condenser (12), and the outlet of the condenser (12) is connected to the accumulator (13), the accumulator (13) Indoor unit through the main supply pipe (24) and multiple parallel units

(15) The inlet is connected, the main liquid supply pipe (24) is simultaneously connected with the liquid discharge port (9), and the plurality of parallel indoor unit (15) outlets are connected to the inlet of the gas-liquid separator (11). , the outlet of the gas-liquid separator (11) is returned through the gas return pipe

(19) Connected to the suction port (2); the communication refers to the communication through the pipe.

2. The single-cold screw compressor multi-unit central air conditioner according to claim 1, wherein: the bottom of the oil separator (10) is provided with a return port (14), and the oil return The port (14) is connected to the suction port (2) through a pipe, and a return solenoid valve (16) is arranged on the pipe between the oil return port (14) and the suction port (2).

3. The single-cold screw compressor multi-unit central air-conditioning apparatus according to claim 1, wherein: the bottom of the gas-liquid separator (11) is provided with an oil outlet (21), and the outlet The oil port (21) is connected to the return pipe (19) through a pipe, and an oil discharge solenoid valve (22) is arranged on the pipe between the oil outlet (21) and the return pipe (19).

4. The single-cold screw compressor multi-unit central air conditioner according to claim 1, wherein: the exhaust pipe (8) and the return pipe (19) are connected by a pipe, and the pipe is connected An unloading solenoid valve (20) is provided.

5. The single-cold screw compressor multi-unit central air conditioner according to claim 1, wherein: the pipe of the liquid discharge port (9) is provided with a thermal expansion valve (17) and a liquid injection solenoid valve. (18).

6. The single-cold screw compressor multi-unit central air-conditioning apparatus according to claim 1, wherein: said screw compressor (1) is three, and said screw compressor (1) is further provided There are oil heater (5), oil balance hole (4) and oil level sight glass (6), and balance oil pipe (7) is connected between the oil balance holes (4) of each screw compressor.

7. The single-cold screw compressor multi-unit central air conditioner according to claim 1, wherein: a check valve is arranged on the pipeline between the oil separator (10) and the condenser (12) (twenty three).

The single-cold screw compressor multi-unit central air conditioner according to claim 1, wherein the main liquid supply pipe (24) is provided with a liquid supply solenoid valve (25).

A single-cold screw compressor multi-unit central air-conditioning apparatus according to any of the preceding claims, wherein: a shut-off valve is provided on each of the pipes communicating between the components.